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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '585691a0adf3ca065a0f30d7a9f1fe09ab7ea566825bade76fde711035952d91' 
  AND token = 'MjmYLg/oU6a/DWyUsDY2B6Lu5OAAToGUE2vcBdZqLRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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