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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca7ce3a2f2d8a3cd1fa44205dc751bcef958d2ed47e46cd58a648335a6cc82e8' 
  AND token = '6q2WJASbx2qqyzuN2yChXYrMVx2xubI/Rb9Ows7Tj6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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