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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '598156a8a4cd29294b29e7d422668a8e648bac1b6d4d218092e55319dc4b1e03' 
  AND token = '9xEvuy9glOkb4Y9dasQrIZIl97SPZncVqUKxf6vYBss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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