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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '832ea20bea02cff28d18cd352cc8c2aa28b7d0e8d918a6a6c3563f2f16a3f8cb' 
  AND token = 'RQjhzXSfa7xgqSX42+VY6qKJRufeF1aGoq1sY1w9Obs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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