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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f8dcb39ec7e683fbe5a5c0683629fa6a04a9107378c67915d52bb93fa892eff' 
  AND token = 'UFalD7AVIgK5dmUIH1KZHzKTCbFXqOf/BLI2o7gx0RE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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