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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb659cdf2c2c6d35426c4366022a72566877a145c6559a30a6a3686a5d53c4b' 
  AND token = 'FkSBEPnisUJTZVoluPs0K/iEmsTFZtPriRVruhbZlHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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