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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6410bae5823b44e92f59247e41e70c37223aab2beccf6c03fcbc4790a37dcf9d' 
  AND token = 'OwqIgFvpnr8AtZ78WsywnAxLtwq3qHqGO+QeLojf6So=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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