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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '333f2d7b7299739d99ba868663ae3763974a05c8dbc00d05beaa2ea99e43930e' 
  AND token = 'c7VPSQfzB8oG72r9vkOGu4ZKIP0s193QkvwBhppDJ8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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