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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82d4d03cb27f2af161d1fdfca9c676b9b16850c383a5acba8ae26a1385996e71' 
  AND token = 'WA8fbJ8ggNugkfCEuXpcDaat6xOO3UJNu+/tKS4Aorg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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