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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1d32799985e1fed7dad320065ba6179358901f8457a9229c3568be4b0aedab2' 
  AND token = 'MXd3IZmzdu6mOb/KrQfAcAtr3LY2CuiU5mHuYMtc3Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}