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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dbf0585ed8be520bc6875943356f9fa233e7c6e9a7e5194d957e40f7ad808e8' 
  AND token = 'GN7HuZ98IsKHq8ryULEwRRP1g+svhlxL7LbDmsPyL40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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