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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c9a99e71301916c8f897bf6ca7f1514973d8626db83825145032f702f293e2d' 
  AND token = 'tHNixCwo3VPYC4uEFfIPel5QUh5cebC87Dlf8YFwukc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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