SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fc3b38dfd83df5ed17ba943ac8f0d3156c7f425d247714ee793f621116475bf' 
  AND token = 'bEutugeACVoXCGP+xnWQlHReXG2NnCNSXJw/HIGsjsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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