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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c140c248914f242094609923c175f5b831a0fe928967c47a0bf2b2eb731088c3' 
  AND token = 'oSThrKovH3SuU0mVfXH3Hhn50V8Ny6gOInzt7Npmcdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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