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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76301c87bf4db45db7e822a1a945909d9bbedb26158d8cfe369f2e6b157aca7d' 
  AND token = 'Kmkc3z51NcP0VSKdQu+0cLZ9ta9aXYppmuGuubCfZkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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