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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93dcc045bbbd6976218ae577293088d91a84b9facb58a201e55a2a0c70fb6657' 
  AND token = 'WxvJbjOCC4PbAozzdybF7uCZVhdMf/6DGnAF1Gmii1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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