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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd58940f3c3d288dfcffc2e21f72356caf70ab8983e2d1b7d64f2fae0267e6d6d' 
  AND token = 'bu2Xj3y1y5nGoLKUglNe8qQiNhjrYAga7rASWl8g+4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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