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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a57bf6a890dc6488553f1ccafa87278bfbf6b1930d7a75330f9a00da4f4fe24e' 
  AND token = 'JUqLLn4JA4Q5Y4Cd+c7douwBdWvY2EbU8OcTWT10WzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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