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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ca028ec18f816654d42d69f04a4befcdacda40121f77bb9616d7da71aba6966' 
  AND token = 'ra81ub8myMYnfVs4qfsgcZd6UPkOn5CDfzOes1HUh68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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