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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cd6178bf26a3ba5068d8836aef7a5259d98d0773e9eaf6454851d846054072e' 
  AND token = 'uFCRl2CgmjgV8470m0+RDrur7JNbmqfpjVgHMzvVueI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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