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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37315dd6b4ec75c9c1655a9c776ac423987305e267b990a473a26d761c9bb26a' 
  AND token = 'HTUVQ0lzzl353dpslfVpJscjACOdR5c+6+nP7a2tCXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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