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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '332857dc14f96ee4128750480b408209d8ba49db86a30d4e31b88d23140bf9b4' 
  AND token = 'QGYzCCfT+I5BwL9vC4krtaxEfzMC+XUKO+MWiO2+T7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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