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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3e7ff03071ab863777d2103110b95fca16e39162aff0f4fef7e95d54e7a4ca7' 
  AND token = 'XjE51e8WgOzXmCK2iV0qACmxrovC5xZf3wwOcsN3x/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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