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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b20dff4f0724861d7c589e1b6418d916b348446be8d019e853f31382cf382ef' 
  AND token = 'gOQlTk1gS+MYT/srQ1PYzLQkfujrpooseJ+gT4hNGpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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