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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d333d9361313bf042c3264f7aa010f1f5474ebf65794e4e52782623b94dddac' 
  AND token = 'b08iIVYr8G82u0kFslycxooGvU6YkdCCXM4qYpDCe/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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