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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a1693e40adf5d486eb7a66e429e5c02ebcde03209b89abc552b82682e24013' 
  AND token = 'et0bnYNlpA1beskbeJKPE4j6dlm15f9Ck7peiVCfHwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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