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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcaaedbd1ba9ae2a7b9fbc696e3c656e54b23ac2d02aef36930478a3757ce65d' 
  AND token = 'EJlvMjZ9gD627EhXIT9xVJ2tybkb6EoRh4558sfgnug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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