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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25b5028a7a8c6a63ba7a54cfc99103e4ba308da70fe33f2c03b86b01e6418047' 
  AND token = '4pMxiDvO6pcOC4ypPALBn5I6dzUS2hfv7nU9II30dD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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