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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6da866c9edbd38826e0c95f84f71b5761ce3720c1b11ecf7578c3ae91060b2ec' 
  AND token = 'mXlI6Y8FyUul0BBD/psJvMY4DjS3f5dRnACjF0pvG9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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