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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfdd6f24ef93ebbc38f4e885ab2ab4fbc65764b521b311f52148b2c48ce766b2' 
  AND token = 'ygnR0We5wBc//FyQLz3JBEN0fk7gLA3NW3eI3GtqB3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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