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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74ba1b6daa014478a0a63d38e73d9403d3d0b8ff9cced6b355c8ca0354daa13e' 
  AND token = 'gdoSckOZDmpbCk7+m/95i3Js5PlZJP4HwK8NhMOgLaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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