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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be8678ce5a9e893a75f9f983fa89be2840ac197af30af70c62e51dbd9763c63d' 
  AND token = 'q/6MnWhkSBzliebof6YmXwm9sSKj8UfK8RU+p6MrMDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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