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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd4670a906f18866ced5dea55d792d7a9155f3c0a628e3daeba963eecf241e7' 
  AND token = 'bnTiSQJYM8XcO6/IhzQS6jQTKo1wwQMH1250eFuoJss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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