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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ebd79da101db28aaf8dda3da44c74d5675ea4b54defe73ae8fe4c7cc8c71924' 
  AND token = 'NYLiK774uSPe6RxYZ5QIqrbIwFv8ol0MISJWT7yhnuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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