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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '960b13b7ebdb55ec48be62ed1f271bac050554f6cf960225fff1b6294bb8862c' 
  AND token = '6Rs/ENYc+kDnh0rkIbciIzv6rq4hmq6+UQrV39kGGwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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