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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c411731d4650efc644b609a15cffcc54fd96b755f1a5d4f7d8e0b3f03c85776c' 
  AND token = 'Skj7nK4H6kuLPadpZl5iKWhHp3L8Gw9VXR3FJ9JqEdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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