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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2140a953c84733a298e3998b91319c96d4f902336745cd2cf814cae9bd12ed77' 
  AND token = 'Zo2c9VuOPZOrsUdhDIlBj2WhvZ+NCMoRd8tkhifE2HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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