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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4bc9d4bd20bf2e1da42cd7780b6c6c74a1f0263b21ead2f93384dcdafcbf09c' 
  AND token = 'CeipqMBx5gHalI+c2FZun9FkGQTldc651dAnwGg6NbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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