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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5091e0022ce51fbb921f279f2899b29e581c40aec5853f77588b700b39a92791' 
  AND token = 'IIg/C334w7TP70UJxZ5H9AjP82w3kgU+UF8xhhxX160=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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