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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e777c4029b2817bddd7f299abf2c8e44233fe087e352036d25e2d670a0862def' 
  AND token = 'tNNUttYmbiQde0fdE6RGpBokwwoBfR4ZByCQbu7h8XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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