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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '227bc4306436c8efd79144b5e7c3f60a94fb2a809b8e5572aa2834d2b8bab4ae' 
  AND token = '+IilFMqsBMXkESrps4HOA3rDYsvtgxhpbgzDeDMpceM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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