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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dd368375870e09e71e04631a45477f512b0bf007a111db77d61d1fd0433b61e' 
  AND token = 'Og3p0AXSckey5B8WBpR+AM7AOYrXWH+BV3LmqoInLmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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