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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe0a7d9f868f81357bd3200cabf4905e97e9eb13697df0430ee4b2c8bc7a5754' 
  AND token = 'cgPA74F4Mqno2s0tEP9VxNeC9CVV6PRT9qEFcoU5X10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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