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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f5d9995decc7bb6984ce5509e036a296acb78ac93297b0c10cef6378ed504e0' 
  AND token = 'sTb05t93WxoAbFEg9Ht22jxSs/Go56O9wmJJJAVzvrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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