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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ee71e91bc6b58a2f7c6335b93171b07dc5e5ca9e0ff54b641acf7dc72f8e0a' 
  AND token = 'LqocH7SuRgeB0CLYV0YRIoTzlmJNirT+D2H/WOSMsIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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