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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c097c34938253efe1713db85107b8764100e2af887415fcbf1e25a81d5f37787' 
  AND token = 'rR9NNUMeNg6BEEAX/6TicGTFFnZavb6lIOV+kkmau6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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