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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac855e411b4619b94b14c40b9da96b36d15f488ac1258c7cc89ead566c3fc91' 
  AND token = '388C0aGFpFZBndOz0XXfT/4VND31RzG+NEg/X7JJ+wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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