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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6934e396e3373eae9029684548816c617d2dec881e047f0ec397a540c1164f2d' 
  AND token = 'KHFBdSV948BSP3IGfPAzcNUd2gA/t5xCNT6C8yj0cdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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