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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbed97db7bb7302d90bb0c2df6433adeb3b247641f4e3c0f2c77bf834c15ed36' 
  AND token = 'jfJLjkyD5ke1zpF4cN8ax9bC0i5QMqfs5W7lactx774=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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