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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b47f8e2e5339a774ea06e73ef044a6e93ac96c1c6a983cc3c830b094fc86a28' 
  AND token = 'nyZiSGwHPpadW8BBeTCMJiNG+H5UK0XDahXeKSjAO5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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