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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ccf7b75097c3fdc4888483fe78938c26acd0f8f254b7e29776cb5e6d66beb20' 
  AND token = 'sLkwOSoJazv4iDlJY05LTQGRT9I/Nu2UpvYIIMYi3/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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