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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd672b597e71df869ace81018a7a805520c94daeb5cca5a82052d5fbde1eaffbd' 
  AND token = 'm2sptUGvED0hYoSpQLZMQuCyU05HsCz0T7VVW6TV+R4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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