SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88994d54e0830e921c1b173be19828625026097af1ca2e050f1dffffdbf17454' 
  AND token = 'zLqpMO6snW8S/yr4oOFAw1CtAy+oHE8INaQXhNLuJ8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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