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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa4c3fc435e3fb46d25ddfd62a98b0c0385a185371bb2c0aefebdb71bb94f3ee' 
  AND token = 'L+OAjmLu/amwsqwcG7Q5Wvr9M8jiK2cMAqz32rf9CMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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