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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94630f7def93dbf13769d80e87a47a6ca384c898f2417e223d0f7bd779adfa30' 
  AND token = 'af5blO8V+x96aAmsRmSsaK8ReQgT4r338DhrQE4PkW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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