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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1584d3c3c40cf2bf3c4502f5a9175e607fa49f99e1bbf7be90b1568fe9ddec3b' 
  AND token = 'XKRMBBf6Qae0P2zyRts5r0U1I4Cw/6moptSDzr3nwg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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