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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ca2a2e5cf584940a589151642fceb3f81af910f81c6a804e597f6317446377c' 
  AND token = 'LK9R08kM8FenoBG9vQiUR9oUXCV59ZQ7CrcrTY+79F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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