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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88dfd2de219347530e4a8e242a4f90b509bb9965af432112589ff33f7249c8c6' 
  AND token = 'NNEJpp1qaiQhv7jY95pRk3LaStZvsN6OiIlnFixUEuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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