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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74600189bcb8b61d03199b189930104141edf08a41cbbaa2acf77afefe84a9d5' 
  AND token = 'AQCxC7J0qrzwIjLiol4b98hbG6PalfwmnCizo7KlbZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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