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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c901d830558ee2a3d85bb06a912faac5643780027a1bd4a58cc4ab70e3b02c79' 
  AND token = 'GNxUibfJBSiSb8DBnu6GD10rDRMLRf9MkkUkbx2oN7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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