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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3254017493fa43e3b45d3465476c470f99b9fe74eb8e930b464fb3d002bf9e7' 
  AND token = 'gwbfBNr8G4SD2c1zRqZqYP0V0VhspWUx+19Wfx3e/i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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