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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb96f1db6d614c7dd4720668ee62e8661c2076eb2cc3b24dba778c8bddf30a6e' 
  AND token = 'JsxoqzWBebYYGYoPcUpkVF/RkWj0LwO9uL7csy3RCi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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