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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f6f0eab7cbdc25984443441a8cc568047f229072267876b04f2b79646551509' 
  AND token = '883TxOf9C/yWfLx5yletHPdIQnaT6wExZlTOxGe8jek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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